My solution to doom scrolling on the desktop was to edit my /etc/hosts file to disallow me from going to the offending sites. After a few weeks, the habit was broken and I didn't even miss them anymore.
There was also Twitter, which had also solved the problem by itself. After the take-over, the quality of content rapidly plummeted so hard, at certain point I just didn't feel like ever visiting the site again.
So I'm almost thankful to these companies for actively pushing people out like that, y'know? I'm just sorry for people still stuck in there, it must be even more miserable presently...